The Variable Induction Control (VIC) solenoid is an ON/OFF type of solenoid which switches the pressure introduced to the VIC vacuum actuator between intake manifold pressure and atmospheric pressure. Battery positive voltage is supplied to the VIC solenoid via the MFI relay. When the ECM turns the power transistor inside the module on, current flows in the solenoid coil and the negative pressure inside of the intake manifold is introduced to the VIC vacuum actuator. This causes the VIC vacuum actuator to operate and close the control solenoid.
The VIC solenoid is located next to the EGR valve on the engine.
- Unplug the VIC solenoid and the MFI relay harness connectors. Insert the circuit tester probes into both ends of the harness and check for continuity between the VIC solenoid terminal 1 and the MFI relay terminal 3. If no continuity exists, repair the harness between these two terminals.
- Unplug the ECM connector and check for an open or short-circuit to ground between the VIC solenoid terminal 2 and the ECM terminal 20. If there exists such a problem, repair the harness between the two terminals, otherwise the harness is good.
A vacuum pump capable of producing more than 10 in. Hg (33.8 kPa) of vacuum will be needed to perform this test.
Apply negative pressure to the vacuum tank side nipple (connect to the white vacuum hose) of the VIC solenoid with a hand vacuum pump. Check for air-tightness when voltage is applied and removed from the VIC solenoid terminals.
- When the battery positive (+) voltage is applied, the other nipple of the VIC solenoid should be open and the negative pressure should leak.
- With the battery positive (+) voltage applied, cover the other nipple with your finger and the negative pressure should be maintained.
- When the battery positive (+) voltage is not applied and the other nipple is left open, the negative pressure should be maintained.
See Figure 1
Use an ohmmeter to measure the resistance between the two terminals (coil) on the VIC solenoid. The resistance should be 36-44 ohms at 68°F (20°C). If the VIC solenoid fails any of these tests, replace it with a new one.
REMOVAL & INSTALLATION
To remove the VIC solenoid, unplug and label the harness connector and vacuum lines and remove the mounting bolt. Remove the component from the engine. To install, securely attach the component to the engine with the mounting bolt. Connect all of the vacuum lines and the harness plug.